:root {
    --m-color: #000000;
    --bg-color: #ffffff;
    --card-bg: #ffffff;
    --border-color: #e1e4e8;
    --text-color: #1a1a1a;
    --radius: 0px;
    --btn-text: #ffffff;
}

body { 
    margin: 0; 
    background: var(--bg-color); 
    color: var(--text-color); 
    font-family: 'Inter', system-ui, -apple-system, sans-serif; 
    -webkit-font-smoothing: antialiased; 
    line-height: 1.6; 
}

.top-nav { 
    position: fixed; 
    top: 0; 
    width: 100%; 
    height: 70px; 
    background: rgba(255,255,255,0.9); 
    backdrop-filter: blur(20px); 
    z-index: 2000; 
    border-bottom: 2px solid var(--border-color); 
}

.nav-inner { 
    max-width: 1280px; 
    margin: 0 auto; 
    height: 100%; 
    display: flex; 
    align-items: center; 
    justify-content: space-between; 
    padding: 0 20px; 
}

.nav-links { 
    display: flex; 
    gap: 40px; 
}

.nav-links a { 
    color: var(--text-color); 
    text-decoration: none; 
    font-weight: 800; 
    font-size: 14px; 
    opacity: 0.6; 
    transition: 0.3s; 
    text-transform: uppercase; 
}

.nav-links a:hover, .nav-links a.active { 
    opacity: 1; 
    color: var(--m-color); 
}

.primary-btn { 
    background: var(--m-color); 
    color: var(--btn-text); 
    padding: 15px 35px; 
    border: none; 
    border-radius: var(--radius); 
    font-weight: 900; 
    font-size: 16px; 
    cursor: pointer; 
    text-transform: uppercase; 
    letter-spacing: 2px; 
    transition: 0.4s; 
    box-shadow: 0 10px 20px rgba(0,0,0,0.1); 
}

.primary-btn:hover { 
    transform: translateY(-3px); 
    filter: brightness(1.1); 
    box-shadow: 0 15px 30px rgba(0,0,0,0.3); 
}

.primary-btn:disabled { 
    background: var(--border-color); 
    color: var(--text-color); 
    opacity: 0.3; 
    cursor: not-allowed; 
    box-shadow: none; 
    transform: none; 
}

.input-box { 
    width: 100%; 
    height: 70px; 
    background: var(--bg-color); 
    border: 2px solid var(--border-color); 
    color: var(--text-color); 
    padding: 0 25px; 
    margin-bottom: 30px; 
    font-size: 18px; 
    font-weight: 800; 
    border-radius: var(--radius); 
    outline: none; 
    transition: 0.3s; 
    box-sizing: border-box; 
}

.input-box:focus { 
    border-color: var(--m-color); 
}

.bento-grid { 
    display: grid; 
    grid-template-columns: repeat(4, 1fr); 
    gap: 25px; 
    margin-top: 40px; 
}

.product-card { 
    background: var(--card-bg); 
    border: 2px solid var(--border-color); 
    border-radius: var(--radius); 
    transition: 0.4s; 
    display: block; 
    text-decoration: none; 
    color: inherit; 
    overflow: hidden; 
    position: relative; 
}

.product-card:hover { 
    border-color: var(--m-color); 
    transform: translateY(-8px); 
    box-shadow: 0 20px 50px rgba(0,0,0,0.15); 
}

.p-img { 
    width: 100%; 
    aspect-ratio: 1.1; 
    display: flex; 
    align-items: center; 
    justify-content: center; 
    background: rgba(0,0,0,0.03); 
}

.p-img img { 
    width: 60%; 
    transition: 0.6s; 
}

.product-card:hover .p-img img { 
    transform: scale(1.1); 
}

.p-info { 
    padding: 30px; 
    border-top: 1px solid var(--border-color); 
}

.detail-wrap { max-width: 1300px; margin: 100px auto; display: grid; grid-template-columns: 1fr 450px; gap: 60px; padding: 0 20px; min-height: 80vh; }
.detail-media { background: var(--card-bg); border: 2px solid var(--border-color); padding: 50px; text-align: center; border-radius: var(--radius); }
.detail-media img { width: 80%; filter: grayscale(1); transition: 0.4s; }
.detail-media:hover img { filter: grayscale(0); transform: scale(1.05); }
.detail-console { background: var(--card-bg); border: 2px solid var(--border-color); padding: 60px; border-radius: var(--radius); }
.price-tag { border: 2px solid var(--m-color); padding: 40px; margin: 40px 0; display: flex; justify-content: space-between; align-items: center; background: var(--bg-color); border-radius: var(--radius); }

@media (max-width: 1100px) { 
    .bento-grid { grid-template-columns: repeat(3, 1fr); } 
    .detail-wrap { grid-template-columns: 1fr !important; } 
}
@media (max-width: 800px) { 
    .bento-grid { grid-template-columns: repeat(2, 1fr); } 
    .nav-links { display: none; } 
}